Verification of truth — core requirement of a format: A debate always comprises which of the following?

Introduction / Context:
A debate is a structured discussion of opposing viewpoints. We must choose what is always present, across all settings from formal auditoriums to informal conversations.

Given Data / Assumptions:

• Venues (room, stage) and audiences are contingent.
• Debate inherently involves people articulating positions—i.e., speakers.

Concept / Approach:
Extract the minimal set: at least two sides must be presented by speakers; even a single speaker debating against prior written points still presupposes speakers for those positions.

Step-by-Step Solution:
Check necessity: speakers are essential; the rest are conveniences.

Verification / Alternative check:
Online/virtual debates may lack a shared room or stage and proceed without audience, reinforcing “speaker” as the invariant.

Why Other Options Are Wrong:
They describe common but nonessential logistics.

Common Pitfalls:
Assuming public performance elements are inherent to the concept.

Final Answer:
Speaker